The Blog

The Science Behind Exercise Footwear

January 5, 2010 | BY danariely

A few weeks ago Reebok unveiled a walking shoe purported to tone muscles to a greater extent than your average sneaker. All you had to do was slip on a pair of EasyTone and the rest would take care of itself.

Exercise without exercise? Great!

Considering the abracadabra-like quality of the shoe, it’s no surprise that it’s been selling like hotcakes. The question of course is “ does it work”?

According to a recent New York Times article on the topic, Reebok has accumulated “15,000 hours’ worth of wear-test data from shoe users who say they notice the difference.” (The company also quotes a study as support, but it’s one they commissioned themselves and only carries a sample size of five.) The two women quoted in the article further echo this sentiment.

Reebok’s head of advanced innovation (and EasyTone mastermind), Bill McInnis, says the shoe works because it offers the kind of imbalance that you get with stability balls at the gym. Unlike other sneakers, which are made flat with comfort in mind, the EasyTone is purposely outfitted with air-filled toe-and-heal “balance pods” in order to simulate the muscle engagement required to walk through sand. With every step, air shifts from one pod to the other, causing the person’s foot to sink and forcing their leg and backside muscles into a workout.

But as the Times article proposes at the end (without explicitly using the term), the shoe’s success could instead come from the placebo effect. Thanks to Reebok’s marketing efforts, buyers pick up the shoes already convinced of their success, a mind frame that may then cause them to walk faster or harder or longer, thereby producing the expected workout – just not for the expected reason.

And there are some reasons to suspect this kind of placebo effect: In a paper by Alia Crum and Ellen Langer. Titled “Mind-Set Matters: Exercise and the Placebo Effect.” In their research they told some maids working in hotels that the work they do (cleaning hotel rooms) is good exercise and satisfies the Surgeon General’s recommendations for an active lifestyle. Other maids were not given this information. 4 weeks later, the informed group perceived themselves to be getting significantly more exercise than before, their weight was lower and they even showed a decrease in blood pressure, body fat, waist-to-hip ratio, and body mass index.

So, maybe exercise affects health are part placebo?

Irrationally Yours

Dan

P.S. If you’ve had the opportunity to try the shoe, leave a comment and let us know what you thought.